drivers: mmc: add driver for Microchip PIC32 SDHCI controller.

This driver implements platform specific glue and fixups for
PIC32 internal SDHCI controller.

Signed-off-by: Andrei Pistirica <andrei.pistirica@microchip.com>
Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun@microchip.com>
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index ceae7bc..9f4b766 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -31,4 +31,10 @@
 	help
 	  Support for the on-chip SDHI host controller on SuperH/Renesas ARM SoCs platform
 
+config PIC32_SDHCI
+	bool "Microchip PIC32 on-chip SDHCI support"
+	depends on DM_MMC && MACH_PIC32
+	help
+	  Support for Microchip PIC32 SDHCI controller.
+
 endmenu